Реактивные двигатели




The radial compressor is much simpler in construc-
tion and therefore much more suitable for model
engines. The air flows into the wheel in the axial direc-
tion and is then flung outward by centrifugal force. On it
own this device is known as a centrifugal compressor.
Once again a single stage consists of a rotor and a stator,
although the pressure increase per stage is much higher
than with an axial compressor stage. As a result gas tur-
bines with radial compressors can often manage with
only one stage.
Additional advantages of the radial compressor are its
robu t nature and ib inherent reliability. The disadvan-
tage is the large frontal area of the machine. Gas turbines
with a radial compressor are therefore always somewhat
The second contmuous flow machine in the gas tur-
bine b the actual turbine. This can be visualised as a com-
pressor "in reverse". The turbine converts pressure
energy into the shaft power which is required to drive
the compressor. Since the hot gases contain much more
energy than the compressor absorbs, the system is self-
sustaining. If the final temperature after the combustion
chamber - what is known as the combustion gas temper-
ature - is high enough, additional power can be extracted
from it.
Like the compressor, the turbine itself may consist of
one or more stages. When the air reaches the turbine
stage it first flows through the stator which converts part
of the pressure energy into kinetic energy. As the gases
pass through the fixed
stator they are accelerat-   
ed in the direction of
rotation of the rotor.



@ 2005 Traplet Publications Ltd

Год      2005

Язык   Английский

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